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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa71b413540c0f0819ad87d0bdfdf68da1124bc10c0478f5e5d6d2ba906a37a8' 
  AND token = 'uHBS7wK2NFCEAtMVKkOZ10ymrCPKxHua4G+w6gzClYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}